With this calculator it is possible to calculate how much PAR light has reached the plant in the greenhouse based on the radiation measured outside at the weather station.
This is strictly an indication and different formulas are used for this conversion. When talking about grow light, mole PAR is the most accurate and pure unit.
(i) Note: Joule is a sum of the radiation (watts per m2) over a whole day / Mol PAR is therefore a sum of the PAR light (µmol per second) over the entire day.
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Radiation outside
Joule/cm²
Transmission greenhouse (%)
PAR inside
Mol PAR/m²
Radiation outside
watt/m²
Transmission greenhouse (%)
PAR inside
µmol PAR/m²/s